portable nebulizer Quiet treatment Two airflow control Compact and portable Suitable for all ages people Autoshutdown in 20 minutes or it will hurt Autoclean function Specifications: Item Name: Ultrasonic Nebulizer Size: 14.0 cm * 11.0 cm * 6.0 cm Atomizing speed: ≥0.25ml/min Atomized particles: ≤3.7μm Capacity Of Cup: 10ml Noise: ≤50dB（A） Tips: The better way use about 20-60 degrees hot water pour into big cup when you first time use it, only can be use clear water. The machine itself does not have the heating function. It support usb cable and AA batteries, you could plug in the usb cable to use the inhaler directly or you could insert AA batteries to use the inhaler. For transportation reason , batteries is not allowed to be shipped by air , you need to prepare it yourself . We suggest you to use power bank with usb cable , so it's convenient . Or you could use good AA rechageable batteries yourself .